2025年8月国际B卷(易) · 第 20 题

2025年8月国际B卷(易) · 原库模块 2 · Q20 原库参考解析

The table summarizes the distribution of age and assigned group for 120 participants in a study. 

One of these participants will be selected at random. What is the probability of selecting a participant from group A, given that the participant is at least 10 years of age?